Estou tentando criar um bitmap de um arquivo Png armazenado no cartão SD e, em seguida, defina esse bitmap em um imageView. Mas não está funcionando.

Aqui está o código:

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;

import com.pxr.tutorial.xmltest.R;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Environment;
import android.widget.ImageView;

public class Getbackground {
    URL url;

    public static long downloadFile(URL url2) {
    try {

        URL url = new URL ("http://oranjelan.nl/oranjelan-bg.png");
        InputStream input = url.openStream();{
        try {

            File fileOnSD=Environment.getExternalStorageDirectory();    
            String storagePath = fileOnSD.getAbsolutePath();
            OutputStream output = new FileOutputStream (storagePath + "/oranjelanbg.png");
                try {

                    byte[] buffer = new byte[1024];
                    int bytesRead = 0;
                    while ((bytesRead = input.read(buffer, 0, buffer.length)) >= 0) {
                    output.write(buffer, 0, bytesRead);
                    }
                    } finally {
            output.flush();
            output.close();
//----------------------------------------------------------------------------------------------------------
            Bitmap BckGrnd = BitmapFactory.decodeFile(storagePath + "/oranjelanbg.png");
            ImageView BackGround=(ImageView)findViewById(R.id.imageView1);
            BackGround.setImageBitmap(BckGrnd);
//----------------------------------------------------------=-----------------------------------------------
            }
            } catch (IOException e) {
            throw new RuntimeException(e);
    } finally {
        try {
            input.close();
            } catch (IOException e) {
            throw new RuntimeException(e);
     }
   }    
 }    
        } catch (MalformedURLException ex) {
         throw new RuntimeException(ex);
    } catch (IOException e) {
      throw new RuntimeException(e);
    }

        return 0;
    }
//-----------------------------------------------------------------------------------------
    private static ImageView findViewById(int imageview1) {
        // TODO Auto-generated method stub
        return null;
    }
//-----------------------------------------------------------------------------------------
}

O arquivo carrega no cartão SD com sucesso, mas eu não consigo obter o img na exibição.